$queryName = 'bat';
$category = $this->_categoryFactory->create()->load('2');
$collection = $this->_productCollectionFactory->create();
$collection->addAttributeToSelect('*');
$collection->addCategoryFilter($category);
$collection->addAttributeToFilter(['name', 'sku'],
          [
           ['like' => '%'.$queryName.'%'],
           ['like' => '%'.$queryName.'%']
          ]);
$collection->setPage(1,15)->load();
return $collection;

$collection->addAttributeToFilter(
      [
       ['attribute' => 'name', 'like' => '%'.$queryName.'%'],
       ['attribute' => 'sku', 'like' => '%'.$queryName.'%']
      ]);